I knew there was a dot.com bubble in the late 90's when everyone at the office was talking up one new dot.com stock or another.
I knew there was a housing bubble in 2007 when I personally knew several people who quit their jobs to flip houses.
Most people have no clue what ethereum is or that it even exists. We're in the top of the first inning in a nine inning game. No bubble here, not yet.